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2 Shets-Sheet 1;

(No Model.)

B HUBNER B 0LT READING DEVIQE.

No. 427,324. Patented May 6, 1890.

lNVENTOfi W WITNESSES ATTORNEYS THE Nuams PETsns co wow um (No Model.) 2Sheets-Sheet 2. E. HUBNER.

BOLT HEADING DEVICE.

Patented May 6, 1.890.

INVENTUH a; M

ATTORNEYS UNITED STATES ATENT OFF CE.

EMIL I-IUBNER, OF NEW YORK, N. Y.

BOLT-HEADING DEVICE.

SPECIFICATION forming part of Letters Patent No. 427,324, dated May 6,1890.

Application filed February 25, 1890- Serial No. 341,709. (No model.)

. To all whom, it may concern.-

Be it known that I, EMIL I-IUBNER, of Ne\v bolt-heading devices adaptedfor use in c011- nection with any bolt-making machine operated by alever or treadle, and has for its object to provide a means whereby abolt may be headed in an effective and expeditious manner and with theleast possible manipulation of the metal rod from which the bolt is tobe formed.

A further object of the invention is to construct the device in such amanner that the sections of the gripper will be interchangeable, andwherein each and every part will be of maximum strength.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth, and

, pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures and letters of referenceindicate corresponding parts in all the views.

Figure 1 is a central vertical section through a machine having thedevice applied, the said section being taken on line 1 1 of Fig. 2. Fig.2 is a plan view of such a machine. Fig. 3 is a plan view of the devicedetached from the machine. Fig. 4 is an end view of one of thegripper-sections and the heading-die or former upon the line 4 4: ofFig. 3. Fig. 5 is a side view of the gripper, illustrating the recess inwhich the heading-die or form er has play, the said heading-die orformer being removed, and the view as taken being upon the line 5 5 ofFig. 3. Fig. 6 is a perspective view of one section of the gripper. Fig.7 is a perspective View of the heading-die or former, looking at theunder side, the said die or former being adapted for making rectangularbolt-- heads; and Fig. Sis a similar view of a former adapted for use inthe construction of hexagonal bolt-heads.

The gripper A is constructed in two sections a and a, both of saidsections being preferably of equal size. In the longitudinal Theheading-die or former B consists of a head 12, substantially rectangularin crosssection and of greater length than width, and an attachedorintegral shank-section 13,which is preferably conical and is adaptedto enter any suitable form of chuck or its equivalent. The head 12 is ofsufficient width only to move freely in the recess 10 of the gripper,Where the two sections are placed together, as illustrated in Fig. 3,whereby a rectangular recessis formed. The length of the head of theheading die or former is, however, much greater than the width of thegripper, as illus trated in Fig. 4. In fact, the heading-die extendsoutward beyond each side face of the gripper.

In the under or working edge of the head of the die or former a recess14 is produced, extending from side to side, the side and top walls ofwhich recess are straight and smooth; but the surface at the junction ofthe. side and base walls of the recess is inclined or beveled, asillustrated at 15 in Fig. 7, the said bevel being adapted to form achamfered surface upon the head of the bolt. By reference to Fig. 7 itwill be observed that the recess 14:, being essentially rectangular, isadapted for use in the construction of square-headed bolts When ahexagonal bolt-head is to be made, the form of die illustrated in Fig. 8is employed, in which the side walls of the recess let are angular, andwhen other forms of boltheads are to be made the recess or cavity 1a inthe former or die head is made to corre spond.

In Figs. 1 and 2 of machine to which the device may be applied, andwhich will illustrate the operation of the device. The machine consistsof a skeleton table 16, having ways 17 produced in the inner sidesurfaces, which ways are adapted to act as guides for a combined cam Ihaveillustrated one form I and plunger 18, the cam being located at oneside of the machine and the plunger at the other side, the plunger beingadapted to carry forward a sliding chuck 18. the said chuck beingpurposed to receive the heading-die or former 15. To the rear end of theplunger an arm 19 is hinged, which is normally held in an upper positionat an angle to the said plunger by a spring 20, attached thereto and toa bracket 21, projected from the rear portion of the bed. Beneath thebracket in the beda shaft 22 is held to revolve, carrying a cam 23, solocated that when the arm 19 is lowered or depressed the said eam willcome in contact with the rear end of the arm and force the plunger andits cam forward. The arm 19 is depressed through the medium of acrank-lever 24, as illustrated in Fig. 2. The cam attached to theplunger is adapted to engage with a vertical rocking bar 2-1:, which ispivoted beneath the table, as illustrated in Fig. 1, the

upper end of the bar being adapted to extend upivard flush with orbeyond the table at one end, for a purposehereinafter described, and thesaid rocking bar is normally drawn in the direction of one side of thetable by means of a spring 25, attached to the table and to the upperportion of the said bar. Immediately at one side of the upper end of therocking bar 24 one section of the gripperis held to slide upon the bedbetween one end surface of the bed and a guide-strip 26, the saidsection being held to place through the medium of a strap 27 orequivalent device. The other'section of the gripper is made to abut inproper manner against the section just described, and that section whichcontacts with the rocking bar is capable of lateral,

movement, the other sections being rigidly secured to the table. It willbe observed, as heretofore stated, that when the two sections of thegrippers are brought together a rectangular recess is formed in one sidesurface, and this recess, when the grippers are placed in position,is-immediately opposite the chuck 18*. Consequently when the heading-dieor former is secured in said chuck and the plunger moves in thedirection of the grippers the die will be forced farther into thegripper-recess, as the die or former during the entire operation of themachine never leaves the gripper-recess. It will be further observedthat when the opposed channels 11 of the gripper-sections are broughttogether a round bore is the result.

In operation a rod of round heated metal is inserted in the central boreof the gripper when the section 6!, is slid to one side, which is thecase whenthe plunger is carried in. the

direction of the end of the bed opposite that at w hich th e grippersare located. The inner end of the metal bar inserted in the grippers isi11- troduced into the recess or cavity 14E of the heading-die orformer, and after the grippers have been closed the plunger movesforward and the metal in the recess 14 is upset and four sides of thebolt-head are partly formed.

As the plunger moves backward, the section a of the gripper is againloosened, whereupon the metal is again pushed against the base-wall ofthe recess 14 to complete the formation of the bolt-head, as in thefirst operation enough stock is not obtained to form a perfect head.This second operation usually leaves a fin upon two sides of the head,which is removed by the next step, which consists in drawing thebolt-head from the die, giving the former a quarter-turn, and insertingthe head once more in the die. This latter operation may be repeated asoften as it may be found desirable. Ordinarily, however, the head isturned but three times, and at each turn is kept in contact with thewalls of the recess 14 at each side of the bore, in order to pro- Vide aperfectly-smooth under face for the head.

I desire it to be distinctly understood that I do not confine myself toany form of machine, as heretofore stated, as the heading device, whichis virtually a tool, is applicable to any form of machine upon whichbolts are,

constructed, especially machines operated by a lever or treadle.

Having thus described in yinvention, I claim as new and desire to secureby Letters Patent- 1. In a bolt-heading device, the combination, wit-h agripper constructed in two sections, each section at one end upon eachside being formed with an essentially L-shaped recess and a circularlongitudinal channel, of a heading die or former having a recess formedin its under face open at the sides, the contour of the recess beingmade to conform with the contour of the bolt-head to be made,substantially as shown and described.

2. In a device for heading bolts, the combination, with a gripper formedin two sections, one of which is adapted to be stationary and the othermovable, the opposed surfaces of the sections having an L-shaped recessformed in one end, and a semicircular longitudinal groove extending fromthe basewall of the recess to the opposite end of the section, wherebywhen the sections are united a rectangular recess is produced open atthe sides and intersected by a circular bore, of a die or formercomprising a shank and head, the head being of a width corresponding tothe width of the recess of the gripper and of greater length than thewidth of the sections, and provided in the edge which enters thegripper-recess with a recess open at its sides and conforming to thecontour of the bolt-head to be made, the open sides of the die or formerrecess being normally closed by the side walls of the gripper-recess,substantially as shown and described, and for the purpose specified.

EMIL IIUBN ER.

Witnesses:

J. F. ACKER, C. SEnGwIcK.

IIO

